Comment custom fields example code

Here is a simple example of how to create, display, and manage custom meta data for comments. Most of this is at present undocumented. The important thing is the actions, filters, arguments, returns, and built-in functions; what I’m actually doing with it is irrelevant.

One good example is worth a thousand abstract syntax diagrams.

(Watch out for the line wrapping.)

[Code moderated as per the Forum Rules. Please use the pastebin]

Code is the opposite of poetry.